Whisk together bottled vinaigrette, mint or cilantro, and cayenne in a small bowl.

Taste and adjust the vinaigrette flavor with a little lemon juice.

In a separate bowl, combine sliced onion, bell pepper, diced cucumber, crumbled feta, and chopped olives.

Toss the vegetable mixture with half of the prepared vinaigrette.

In another small bowl, combine the prepared hummus with the remaining vinaigrette.

Cut each pita bread in half, creating pockets.

Spread a quarter of the hummus mixture into each pita half.

Stuff each pita half with the vegetable salad, fresh mint or cilantro leaves, and lettuce leaves.

If not serving immediately, wrap the sandwiches in aluminum foil and refrigerate until ready to serve.